What is the constant "B" in equation in the equation relating to absorption coefficient to incident photon energy:

ahv = B(hv-Eg)1/2

a-absorption coefficient

hv-incident photon energy

Eg-band gap of the material

B- constant

In any scientific papers, generally people used to mention, B is a constant? What time of constant it is? What does this constant meant for? 

Thanks in advance. 

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